Retractor and housing for a retractor

ABSTRACT

Belt retractor and a belt-retractor spring-cassette housing for a belt retractor. The belt-retractor spring-cassette housing can be installed in a particularly simple and therefore cost-effective manner. The belt-retractor spring-cassette housing has a spring core and a driving spring which is held in the spring core, the belt-retractor spring-cassette housing and/or the spring core are designed symmetrically so that the driving spring can have any desired torque direction.

BACKGROUND OF THE INVENTION

The invention relates to a belt-retractor spring-cassette housing which can be connected to a belt retractor. Belt-retractor spring-cassette housings or covers typically contain a driving spring which exerts a torque on a belt spindle of the belt retractor so that the seat belt is retracted.

SUMMARY OF THE INVENTION

An embodiment of the invention includes providing a belt-retractor spring-cassette housing which can be produced and installed in a particularly simple and therefore cost-effective manner.

According to an embodiment of the present invention, a belt retractor housing is provided. The belt-retractor spring-cassette housing and/or a spring core of the belt-retractor spring-cassette housing is designed symmetrically so that the driving spring of the belt-retractor spring-cassette housing can have any desired torque direction.

According to an embodiment of the invention, one substantial advantage of the retractor housing is the ability to use the retractor for different retracting directions of rotation or belt-retracting directions of rotation. Depending on the desired belt-retracting direction of rotation, a driving spring having the matching or corresponding torque direction is installed into the belt-retractor spring-cassette housing. Due to the symmetrical construction of the spring core and/or of the belt-retractor spring-cassette housing, this is readily possible.

A belt-retractor spring-cassette housing can be formed in a particularly simple and therefore advantageous manner by a belt-retractor spring-cassette cover.

According to an embodiment of the invention, a belt retractor is provided that can be produced in a particularly simple and therefore cost-effective manner.

According to an embodiment of the present invention, a belt retractor including a spring-cassette connecting plate to which a belt-retractor spring-cassette housing can be connected is provided.

One substantial advantage of the belt retractor according to the invention is the fact that the retractor can be used very universally because, owing to the design of the spring-cassette connecting plate, the belt-retractor spring-cassette housing or belt-retractor spring-cassette cover already explained above can be used with any desired belt-retracting direction of rotation. The belt-retracting direction of rotation of the belt retractor is therefore determined by the torque direction of the driving spring of the belt-retractor spring-cassette housing.

The spring-cassette connecting plate and the belt retractor overall are advantageously constructed symmetrically so that any desired belt-retracting directions of rotation of the belt spindle are possible, and the belt-retracting direction of the belt retractor is therefore established exclusively by the torque direction of the driving spring of the belt-retractor spring-cassette housing or of the belt-retractor spring-cassette cover. The belt retractor can therefore be used on any desired side of the vehicle, an appropriate driving spring merely needing to be inserted.

In addition, it is regarded as being advantageous if the belt retractor has a sensor device, in particular a belt-strap sensor device or a vehicle sensor. The sensor device is preferably designed so that a belt-retractor spring-cassette housing can be fitted on it.

According to a further preferred refinement of the belt retractor, provision is made for the sensor device to be designed so that, when the belt-retractor spring-cassette housing is connected, a transmission of force between the driving spring and the belt spindle of the belt retractor is ensured. According to this embodiment, the spring-cassette connecting plate can preferably be formed by an outer side of the sensor device. As an alternative, the sensor device and the spring-cassette connecting plate may be arranged on different sides of the belt retractor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only, and are not restrictive of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present invention will become apparent from the following description, appended claims, and the accompanying exemplary embodiments shown in the drawings, which are briefly described below.

FIG. 1 shows a first exemplary embodiment for a belt retractor according to the invention, in which an exemplary embodiment for a belt-retractor spring-cassette cover according to the invention is fitted on the same side as a sensor device of the belt retractor,

FIG. 2 shows a second exemplary embodiment for a belt retractor according to the invention, in which an exemplary embodiment for a belt-retractor spring-cassette cover according to the invention is fitted on the same side as a sensor device of the belt retractor,

FIG. 3 shows a third exemplary embodiment for a belt retractor according to the invention, in which the sensor device of the belt retractor and the spring-cassette side of the belt retractor are situated on different sides,

FIGS. 4 a and 4 b show an exemplary embodiment for a belt-retractor spring-cassette cover according to the invention, and

FIG. 5 shows construction drawings for the belt-retractor spring-cassette cover according to FIGS. 4 a and 4 b in detail.

DETAILED DESCRIPTION

FIG. 1 shows a belt retractor 10 which is equipped on one side 30 of the belt retractor with a tightening device 20. A sensor device 50 is fitted on the side 40 (“mechanism side”) lying opposite the side 30, which sensor device may contain, for example, a belt-strap sensor device and/or a vehicle sensor. Formed on the outer side of the sensor device 50 is a spring-cassette connecting plate (not specifically indicated in the figure) on which a belt-retractor spring-cassette cover 60 is fastened. The belt-retractor spring-cassette cover 60 is therefore situated on the “mechanism side” 40 of the belt retractor 10.

In the belt retractor 10, the tightening device 20 is arranged on the side at the rear in FIG. 1; the sensor device 50 and the belt-retractor spring-cassette cover 60 are attached on the front side in FIG. 1. The belt retractor is preferably designed “mirror symmetrically” so that the arrangement of the tightening device 20, of the sensor device 50 and of the belt-retractor spring-cassette cover 60 may also be the other way around. This means specifically that, in the belt retractor 10, the tightening device 20 may also be arranged on the front side in FIG. 1; the sensor device 50 and the belt-retractor spring-cassette cover 60 would then have to be attached on the rear side in FIG. 1.

FIG. 2 illustrates a further exemplary embodiment for a belt retractor according to the invention. In contrast with the belt retractor 10 according to FIG. 1, the belt retractor according to FIG. 2 does not have a tightening device 20. Also in the belt retractor according to FIG. 2, the belt-retractor spring-cassette cover 60 is arranged on the “mechanism side” 40 of the belt retractor.

FIG. 3 shows an exemplary embodiment for a belt retractor, in which the mechanism side 40 (side with the sensor device 50) is separated from the spring-cassette connecting plate and the belt-retractor spring-cassette cover 60; specifically, the sensor device 50 and the belt-retractor spring-cassette cover 60 are arranged on different sides of the belt retractor.

The belt-retractor spring-cassette cover 60 is therefore designed so that it can be fitted both on the mechanism side 40- and therefore on the outer side of the sensor device 50- and also on the opposite side 30.

FIGS. 4 a and 4 b each illustrate, in a three-dimensional illustration, the manner in which the belt-retractor spring-cassette cover 60 according to FIG. 3 or the belt-retractor spring-cassette cover according to FIGS. 1 and 2 can be constructed in the “interior”. A driving spring 200 which is held in a spring core 210 can be seen.

It can also be seen in FIGS. 4 a and 4 b that the fixing of the driving spring 200 in the belt-retractor spring-cassette cover 60 is symmetrical. The spring fixing in the spring core 210 is also symmetrical.

FIG. 5 shows the belt-retractor spring-cassette cover 60 according to FIGS. 4 a and 4 b once again in an illustration of a detail. Specifically, FIG. 5 shows construction drawings of the belt-retractor spring-cassette cover 60 with different cross sections and views. In this case, the belt-retractor spring-cassette cover 60 is already fastened on a spring-cassette connecting plate 300 which is fastened later in turn on the belt retractor.

FIG. 5 also shows the driving spring 200 which is held in the spring core 210. In this case, the fastening of the driving spring 200 in the spring core 210 is illustrated in detail in detailed views.

The priority application, Germany Patent Application No. 103 20 836.4, filed May 8, 2003, is hereby incorporated by reference herein in its entirety.

Given the disclosure of the present invention, one versed in the art would appreciate that there may be other embodiments and modifications within the scope and spirit of the invention. Accordingly, all modifications attainable by one versed in the art from the present disclosure within the scope and spirit of the present invention are to be included as further embodiments of the present invention. The scope of the present invention is to be defined as set forth in the following claims. 

1. A belt-retractor spring-cassette housing including a spring core and a driving spring retained in the spring core, wherein the belt-retractor spring-cassette housing and/or the spring core are designed symmetrically so that the driving spring can apply torque in any desired direction.
 2. The belt-retractor spring-cassette housing of claim 1, wherein the belt-retractor spring-cassette housing comprises a belt-retractor spring-cassette cover.
 3. A belt retractor, comprising a spring-cassette connecting plate configured to be connected to a belt-retractor spring-cassette housing, wherein the housing includes a spring core and a driving spring retained in the spring core, wherein the belt-retractor spring-cassette housing and/or the spring core are designed symmetrically so that the driving spring can apply torque in any desired direction.
 4. The belt retractor of claim 3, wherein the spring-cassette connecting plate has a symmetrical construction such that a belt-retractor spring-cassette housing can be connected with any desired spring-torque direction.
 5. The belt retractor of claim 4, wherein the belt retractor is designed so that any desired belt-retracting directions of rotation of a belt spindle are possible, and the belt-retracting direction of the belt retractor is determined exclusively by the torque direction of the driving spring.
 6. The belt retractor of claim 5, wherein the belt retractor includes a belt-strap sensor device and/or a vehicle sensor.
 7. The belt retractor of claim 6, wherein the belt-retractor spring-cassette housing is fitted onto the sensor device.
 8. The belt retractor of claim 7, wherein the sensor device is so that, when the belt-retractor spring-cassette housing is fitted onto the sensor device, a transmission of force between the driving spring of the belt-retractor spring-cassette housing and the belt spindle of the belt retractor is ensured.
 9. The belt retractor of claim 1, wherein the spring-cassette connecting plate is formed by an outer side of the sensor device.
 10. The belt retractor of claim 8, wherein the sensor device and the spring-cassette connecting plate are arranged on different sides of the belt retractor. 